I got many requests from my customers on how to make this happens and I used to create a package and send it to the users for import.
However with the new Licensing structure, everybody owns the modifier as a part of the starter pack! Therefore anyone can do the following steps to activate this:
- Open the Form.
- Go to Tools>> Customize >> Modify Current Window
- Select the field and switch “Required” to true as shown below:
Hope that this helps!